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Wire Dulling

Posted By: John AldermanMonday, 10 July 2000, at 9:43 a.m.

I recently installed a new circuit. I noticed, a few weeks later, that the exposed portions of the wires (especially the bare ground) had dulled considerably since I installed then, similar to the way that a penney would. Is this a problem? Will some type of oxide buildup eventually accumulate, causing a problem? Just wondered-